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Flying Planes

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asroc | 18:58 Wed 14th Feb 2007 | Quizzes & Puzzles
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An aeroplane is flying horizontally in a straight line at 360mph will pass directly over the head of an observer. Twenty seconds ago the angle of the plane above the horizontal measured by the observer was 30degrees. Ten seconds ago it was 60 degrees.

When was it directly overhead?
How high is it above the ground?
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directly overhead 5 seconds ago

4573 feet (= 0.87 of statute mile)

phew!
Question Author
Thanks - thats awesome.
asroc

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